Ty'n y Celyn farm is located 'to the north of a public bridleway which extends northeast from the B5429 at Clyttir to Hirwaen,' approximately two miles north east of Ruthin. The 'small stone built farmhouse' dated from the early 19th century. On the first edition of the 25inch OS maps, published in 1875, depicts a farmyard, with two roughly rectangular buildings parallel to one another, orientated south west to north east. The second and third editions of the 25inch maps, published in 1899 and 1912 respectively, depict a similar picture, although they also record two much smaller buildings on the north eastern and south western end of the farmyard. The 2017 edition of the OS map and aerial photography from 2014 show that the two elongated rectangular buildings remained intact, and had been joined by three larger agricultural buildings to the north west of the original farmyard.
In the late 2010s, the 19th century stone farmhouse and associated brick built barn was demolished, and work began on 'a new build primarily set within the courtyard that existed between the former farmhouse and the barn.'
Sources: modern and historic OS maps; modern aerial photography; Gwynedd Archaeological Trust report entitled 'Tyn y Celyn, Llanbedr Dyffryn, Denbighshire: Archaeological Watching Brief' by Stuard Reilly (project no. G2558, report no. 1430)
M. Ryder, RCAHMW, 10th April 2019